Corrosion resistance of multilayer coatings of nanolayered Cr/Ni electrodeposited from Cr(III)–Ni(II) bath

Etminanfar, Mohamadreza; Sohi, M. Heydarzadeh

doi:10.1016/j.tsf.2012.03.127

Cited by 40 publications

(23 citation statements)

References 20 publications

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“…There is a scarcity of the work reporting the fabrication of ML coating using pulse duty cycle and frequency. In the previous works, the current density, agitation rate, and pulsating between two none‐zero voltage values have been used to prepare the ML structure by pulse electrodeposition . In the present work, the ML coating with a modulated chemical composition was deposited by manipulating the pulse duty cycle.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, cracks may be formed in the surface of electrodeposits and the cracks act as active paths for the diffusion of anions inside the deposits . Therefore, fabrication of multilayer (ML) coating is proposed to seal cracks from underlying substrate for corrosion protection . This method has been employed for several alloy systems .…”

Section: Introductionmentioning

confidence: 99%

“…Further, it has been reported that some ML coatings exhibit higher corrosion resistance than single layer ones . In ML coatings, the corrosion resistance increases due to the reduction in interconnecting pores and defect . The study of the properties of MLs is of considerable technological interest.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Corrosion properties of Ni‐Fe‐Cr (III) multilayer coating synthesized via pulse duty cycle variation

Torabinejad

Mahmood

Rouhaghdam

2016

Materials & Corrosion

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Ni-Fe-Cr multilayer coatings were successfully electrodeposited on the mild carbon steel. The frequent variation of pulse duty cycle between two values of 20 and 90% prepared multilayers with 8, 16, and 32 bilayers. The results indicate that contents of constituent elements varied in an alternative manner. The corrosion performance of the coatings was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a 3.5% NaCl solution and 0.1 M H 2 SO 4 solution. The results showed that multilayer structure improves the corrosion resistance in comparison to monolithic coatings. Increasing the number of bilayers from 8 to 32 resulted in a consequent increase in the corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion properties of Ni‐Fe‐Cr (III) multilayer coating synthesized via pulse duty cycle variation

Torabinejad

Mahmood

Rouhaghdam

2016

Materials & Corrosion

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“…Hui Zhang et al [12] have reported that the corrosion resistance of the Ni-Cr coatings obtained from DMF mixed bath is much better than that obtained from aqueous bath. Etminanfar et al [13,14] have fabricated Ni-Cr multilayer electrodeposits with high corrosion resistance by using pulse current and modulated agitation. The improvement of the surface quality likely relates to the early release of hydrogen during the 'off' period of the pulse electroplating.…”

Section: Introductionmentioning

confidence: 99%

MORPHOLOGICAL, STRUCTURAL, MICROHARDNESS AND ELECTROCHEMICAL CHARACTERIZATIONS OF ELECTRODEPOSITED Cr AND Ni–W COATINGS

Elkhanssa

Temam

Belahssen

et al. 2018

Acta Metall Slovaca

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Currently, Ni-Cr coatings are widely used in a number of important applications due to their excellent properties. In this study, Ni-Cr alloys were electrodeposited from citrate bath onto Cu substrates by using different values of applied current densities. The effects of plating deposition current density on morphological and structural characterization of Ni-Cr electrodeposited coatings were investigated by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). Microhardness of the coatings is also evaluated using Vickers’s microhardness. Potentio-dynamic polarization and electrochemical impedance spectroscopy (EIS) tests in 3.5wt % NaCl solution were used to evaluate corrosion résistance of Ni-Cr coatings. The results showed that the surface morphology of the all coatings contained micro cracks and pores. XRD patterns indicate the formation of Ni-Cr and Cr3Ni2 phases. Microhardness measurements show that all Ni-Cr samples are hardener than copper substrate. Electrochemical tests show that 3 A/dm² is an optimal value of applied current density in the sense of the least value of Ecorr and the best charge transfer resistance Rp.

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“…To limit the film stresses during deposition, pulseplating conditions are used assuming that they can create a multilayer (ML) coating that is compositionally modulated. Moreover, in the ML structure, the probability of interconnected pores and micro-cracks can be omitted [16]. Unique characteristics of multilayered structures, including a high volume fraction of grain boundaries and layer interfaces, which effectively hinder dislocation activity, provides a suitable rout to improve the properties of structural materials [17].…”

Section: Introductionmentioning

confidence: 99%

Ni–Fe–Mn–(nano)Al2O3 Coating with Modulated Composition and Grain Size

Torabinejad

Mahmood

Rouhaghdam

2016

Trans Indian Inst Met

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Composition modulated nanocomposite of NiFe-Mn-Al 2 O 3 coatings were fabricated on mild steel using single bath technique through alternative variation of duty cycle at constant frequency (VD) and repeated alteration of frequency at constant duty cycle (VF). The number of layers was 32 and thickness of each layer was 2.5 lm. The results of microstructure examination by SEM and EDS for VD coatings exhibited that Fe/Al 2 O 3 -rich layers adjacent to Mn rich ones were deposited in a frequent manner. In the case of VF coatings, alternative variation of frequency did not affect the chemical composition of matrix and only changed the content of embedded nanoparticles. The microhardness of Ni-Fe-Mn-Al 2 O 3 multilayers compared to monolithic and multilayer Ni-Fe-Al 2 O 3 of the same thickness was significantly increased because of Mn incorporation into the matrix. The corrosion resistance was found to be better for VD coating in comparison to the VF ones.

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Corrosion resistance of multilayer coatings of nanolayered Cr/Ni electrodeposited from Cr(III)–Ni(II) bath

Cited by 40 publications

References 20 publications

Corrosion properties of Ni‐Fe‐Cr (III) multilayer coating synthesized via pulse duty cycle variation

Corrosion properties of Ni‐Fe‐Cr (III) multilayer coating synthesized via pulse duty cycle variation

MORPHOLOGICAL, STRUCTURAL, MICROHARDNESS AND ELECTROCHEMICAL CHARACTERIZATIONS OF ELECTRODEPOSITED Cr AND Ni–W COATINGS

Ni–Fe–Mn–(nano)Al2O3 Coating with Modulated Composition and Grain Size

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